Superheater for water-tube boilers.



H. E. YA-RROW.

SUPERHEATER FOR WATER TUBE BOILERS.

APPLICATION FILED JAN-29, 1914.

1 1 43,476. Patented June 15, 1915.

3 SHEETSSHEET I.

wen-Z227 flaw" 0 M Z, arrow THE NORRIS PETERS C0 PHOTOJJTHQ, WASHINGTON.B1 c.

H. E. YARROW.

SUPERHEATER FOR WATER TUBE BOILERS.

APPLICATION FILED JAN-29,1914- p Patented June 15, 1910.

3 SHEETSSHEET 2.

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THE NORRIS PETERS co. PHDTO-LITHQ. WASHINGTON. Dv C.

H. E. YARROW.

SUPERHEATER FOR WATER TUBE BOILERS.

APPLICATION FILED JAN-29,1914.

Patented June 15, 1915.

3 sneaks-SHEET 3 THE NORRIS PETERS 60., FHOTO-LITHQ, WASHINGTON. n. c,

I residing HAROLD EDGAR YARROW, 0F SCOTSTOUN, GLASGOW, SCOZIZYIZIABTLD.-

SUPERHEATER FOR WATER-TUBE BOILERS.

. Specification of Letters Patent.

Patented June 15, 1915.

Application filed January 29, 1914. Serial No. 815,250.

To all whom it may concern Be it known that I, HAROLD EDGAR YAR- ROWgil,subjectvof the-King of Great Britain, in'Scotstoun, Glasgow, Scotland,and whose post-ofiice address is care of Yar- L'imited, of Scotstoun,Glasgow, in the county of Renfreu, Scotland, have invented certain newand'useful Improvements in Superhea'ters for Water-Tube Boilers, ofwhich the following is a specification. v a

This invention relates to superheaters for water tube boilers and hasfor its primary objects to facilitate the re-tubing (partly or wholly)of the superheater, and the inspection, cleaning or stopping of thetubes.

The invention further comprlses lmprovements 1n the bafflingarrangements of single drum superheaters, whereby the steam 1sconstrained to travel successively different sections of the superheatertubes, and also improvements in the means for distributing andcontrolling the flow of furnace gases among the tubes of suchsuperheaters;

he invention will be hereinafter more specifically described withreference to the accompanying drawings, wherein- I igure l is a parttransverse section of a Yarrow boiler fitted-with a superheater of theimproved type; Fig. 2 is a longitudinal p the same; Fig. 3 is-alongitudinal section on an enlarged scale of the superheater drum withparts broken away; Figs. 4' and 5 are transverse sections on lines H and5-5 respectively of Fig. 3; Fig. 6 isa vertical section of the uptakefor the furnace gases shown in Fig. 1 but on an enlarged scale; and Fig.7 a part elevation of the damper controlling the up a (e. V

or U-shaped superheater tubes having both their ends expandedinto thesteam drum,

. as usual without As shown in these drawingsthe' superheater is of thesingle drum type withbent I this chamber it passes -cl in the firsttransverse enable the superheater tubes 6 to be expanded into the wallof the drum from the inside, and in the case of water tube boilerssuitable for vessels of the destroyer class the drum would have adiameter of from 18 inches to two feet. The outside of the drum may beturned eccentric in relation to the inside so as to give an increasedthickness of wall in that part of the drum into which the tubes areexpanded, and in order to increase the area of the space between thetubes at their lower ends as compared with the corresponding space attheir upper ends the tubes are notarranged parallel with each other,viewed transversely, but are spread drum (as dotted lines in Fig. 1),thereby equalizing more or less completely (and without the use ofbattles) the resistance'to the How of the furnacegases along all pathsfrom the combustion space to the uptake. The tubes may, however, bespaced interfering with the other advantages of this invention.

Concentrically arranged within the drum a and extending throughout itswhole length indicated by is a tube 0 which issupported by means oftransverse partitions d which also divide the space between the tube andthe drum into annular chambers,thre'e such chambers be ,ing shown in theconstruction illustrated.

Further, each of these chambers is divided into two parts 6,6 bylongitudinal partitions 0 which, in conjunction with the transversepartitions d, cause the steam to follow the course hereinafterdescribed.

The steam entering the inlet connection 7,

passes mto the first section of the inner tube 6 leading from thischamber, returning by the upper or outer limbs of the tubes to thechamber e. From through openings partition cl to the chamber 6 of thesecond section of the superheater drum, thence through the upper orouter limbs of the tubes belonging to this section, returning throughthe lower limbs of these tubes to the chamber e, and passing thencethrough the slits 0 into the interior of the inner tube 0, whence itpasses direct to the third section of the superheater issuing from theinner tube of the same through the slits 0 in the wall of the tube whichopen into the chamber 6, from which the steam passes to the lower limbsof the superheater tubes 7) belonging to this section, returning throughthe upper limbs to the chamber 0 and thence passing through the openings(Z in the end partition (Z to an end chamber 9 fitted with an outletsteam connection g. This end chamber is closed by a cover g which can beremoved to enable the inner tube 0 and the partitions (l, 6, which aresecured by means of angle irons to the inner tube, to be withdrawn fromthe drum a and thereby permit access to the ends of the superheater t1bes for the purpose of inspection or plugging,

It will be seen from the drawings, and in particular Fig. 2, that thefirst transverse partition cZ extends not only across the annular spacebetween the drum (0 and the tube 0, but also across the latter so as tocut off direct communication between the first and second sections ofthe tube 0, while permitting communication through the opening cZbetween the chamber 6 and the first and second sections, whereas thesecond transverse partition d cuts ofi communication between the secondand third sections of the drum but leaves the second and third sectionsof the tube a in direct communication with each other.

Should it be necessary at any time to retube the superheater eitherpartly or completely, either or both of the steam connections 7", g areremoved and also if required the side casing h and the superheater drumand tubes are swung outwardly through a small angle about the axis ofthe drum to a position such as indicated by the line 00, 1 in Fig. 1,which permits the operations of removing and replacing one or more tubesto be carried out.

The uptake through which the gases pass after traversing the outside ofthe superheater tubes may be controlled by a hinged damper z preferablybalanced by a counterweight-indicated in dotted lines at 7', Fig. 1.This damper is preferably made in sections (three are indicated in thedrawings) and each section is pivotally connected at or near its centerwith an arm 76 fast on a spindlem which is preferably hollow for theintroduction of a cooling medium and extends longitudinally of theboiler along the whole length of the uptake, suitable means beingprovided to work the damper from the stokehole without the use of longrods and gearing. The spindle m 1s supported at suitable lntervals inbearings carried by brackets n fixed to a wall of the uptake,and

the position shown in drum, of means -ing said drum into sections,

stops 0, of which there are preferably two in each section of thedamper, are secured at appropriate points on the opposite wall of theuptake to arrest and support the outer edge of the damper when in theclosed position, the inner edge (which is preferably slightly curved forthe purpose) passing between the lower side of the spindle m and alongitudinal plate or baffle 79, so as to occupy dotted lines in Fig. 6.

Having thus described the nature of the said invention and the bestmeans I know of carrying the same into practical effect, I claim 1. Asuperheater for water tube boilers having a single steam drum, whereinthe drum is fitted with an inner tube and transverse and longitudinalbailies dividing the drum into sections, scribed.

2. A steam superheater having a single steam drum and an inner tube andtransverse and longitudinal baflles dividing the drum into sections,said inner tube and batfies being removable upon removing an end orcover plate, substantially as described.

3. A steam superheater having a single steam drum and an inner tube andtranssubstantially as deverse and longitudinal baffles dividing the druminto sections, said inner tube and baffle being removable in one pieceupon removing an end or cover plate, substantially as described.

a. A superheater for water tube boilers of the kind in which superheatertubes, of substantially U-shape'are expanded into a single steam drumwith the tubes projecting upwardly, wherein the drum is adapted to berotated about its longitudinal axis either with or without removal ofthe side casing of the furnace so as to project the tubes forward oroutward to render them accessible for the purpose of removal orreplacement,

substantially as described.

'5. A steam superheater having a plurality of bent or U-shaped elementsexpanded into a single steam drum or header, the legs of adjacentelements whole length out of parallel so that the gas passage spacebetween them increases in the direction toward the'drum or header.

"6. The combination with a steam superheater comprising a plurality ofbent or U- shaped tubes expanded into a 'single steam for controllingthe flow of the heating gases, comprising a damper made in one or moresections each pivotally hung at or about its arms carried by a rotatablespindle, substantially as described. 7 V

7 In a superheater for water tube boilers, the combination with a singlesteam drum or header of aninner tube and bafiles divida plurality ofbeing throughout their center upon an arm or bent or U-sha panded .intos elements b fore described.

drum, substantially as hereinbeped superheater elements ex- '(1 drum,the legs of adjacent Washington, D. G.

itnesses specification i ng Witnesses.

DANIEL MCINTYRE,

LAN.

have signed my 11 the presence of DGAR YARROW.

y addressing the "Commissioner of Patents,

